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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962fc5873b2a632954d19c6de89cd2848d5f5b285d4680d3c41ad079f0bf91bb' 
  AND token = '96t852ttA/bJbBOMeE89G/O96rGYtLR9M6r5fK6SWgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}